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Wells heat pump efficiency: 35 outdoor models compared

Wells has 35 heat pump outdoor models certified with this refrigerant group, in 70 AHRI-certified combinations. Each model is compared with models of the same size and duct type, so the scores below do not depend on which sizes Wells makes. Wells has no QMID (IRS Qualified Manufacturer ID) on file, so it is not ranked against other manufacturers.

New to heat pump ratings? The Simple view explains them in plain words →

ManufacturerData as of updated · sources

Outdoor models
35
AHRI certifications
70
Efficiency index
57%
Typical model vs same-size, same-type peers (45 models)
Meet CEE 2025
74.3%
26 models

How Wells compares with comparable models

For each rating: the share of same-size, same-type models that a typical model of this manufacturer beats (50% is typical), its rank, and the raw median for context. Raw medians are not comparable across manufacturers that make different sizes.
Wells against every ranked manufacturerPeer scores, 0–100 · grey ticks: each ranked manufacturer · shaded: the middle half of Wells’s own modelsWells is strongest on HSPF2 (its typical model beats 70% of comparable models) and weakest on COP at 5°F (40%).
  • Wells
  • Middle half of its models
  • Other ranked manufacturers
Wells

Source: AHRI Directory, NEEP · as of

Average peer percentile of Wells’s models
RatingBeats comparable modelsRankRaw median
Efficiency index45 models scored57%Not ranked—
COP at 5°F45 models scored40%Not ranked1.85
Capacity retention at 5°F45 models scored60%Not ranked79%
HSPF245 models scored70%Not ranked9.5
SEER245 models scored65%Not ranked20.2
EER245 models scored50%Not ranked11.0
Heating capacity at 5°F45 models scored59%Not ranked23,000 Btu/h

Standards met

Share of Wells’s models with at least one qualifying certification
StandardShareModels
CEE 2025 Tier 1 (Split ASHP)74.3%26
CEE 2026 Tier 1 (Split ASHP)68.6%24
CEE Advanced Tier (Split ASHP)0%0
Xcel Energy Colorado cold-climate ASHP (2025)60%21
DOE Cold Climate Heat Pump Challenge0%0
ENERGY STAR Cold Climate60%21

Sizes and duct types offered

Models per peer group, and how they score against the other models of that group.
Wells’s models inside each size and duct typeShape: every model of the group · blue: the middle half of this manufacturer’s models there, median dot, 10th–90th percentile line
  • Wells (median, middle 50%, 10th–90th)
  • All models of the group
Ducted, up to 1.5 tons2.00884 modelsDucted, 2 tons2.00821 modelsDucted, 2.5–3 tons1.901,614 modelsDucted, 3.5–4.5 tons1.911,492 modelsDucted, 5 tons and up1.90239 modelsNon-ducted, up to 1.5 tons1.902,417 modelsNon-ducted, 2 tons1.87611 modelsNon-ducted, 2.5–3 tons1.85975 modelsNon-ducted, 3.5–4.5 tons1.97438 modelsmedian

Source: AHRI Directory · as of

Share of comparable models beaten, per peer group
Size and duct typeModelsIndexCOP@5°FHSPF2SEER2
Ducted, up to 1.5 tons259%32%59%68%
Ducted, 2 tons153%50%84%53%
Ducted, 2.5–3 tons962%40%81%70%
Ducted, 3.5–4.5 tons858%33%79%76%
Ducted, 5 tons and up157%57%70%88%
Non-ducted, up to 1.5 tons1156%47%62%58%
Non-ducted, 2 tons249%34%61%61%
Non-ducted, 2.5–3 tons757%42%66%61%
Non-ducted, 3.5–4.5 tons451%31%58%56%

Every Wells model in the market

Wells’s 45 models with a known size and duct type, over the shape of the whole catalog.
Wells models by size and ratingColoured: Wells · grey shapes: all 11,475 models · lines: catalog medians by size
  • Wells models
  • Ducted median by size
  • Non-ducted median by size
  • Every model at each size (width = count)
  • Standard threshold

Dots: 45 wells models, each through its representative certification, in the colour of the rating shown. The grey shapes count all 11,475 models, half a ton at a time.
Show the data as a table
COP at 5°F by size and duct type (every model, by rated cooling capacity)
Duct type, sizeModels10th pct.25thMedian75th90th
Ducted, 0.5 tons1751.701.851.902.102.26
Ducted, 1 ton3401.851.902.002.402.65
Ducted, 1.5 tons7891.751.852.002.202.55
Ducted, 2 tons7821.731.802.002.102.33
Ducted, 2.5 tons7351.711.801.902.092.48
Ducted, 3 tons6521.681.701.902.062.36
Ducted, 3.5 tons6411.611.801.952.202.50
Ducted, 4 tons3671.701.801.912.022.52
Ducted, 4.5 tons5441.701.801.912.082.34
Ducted, 5 tons251.801.801.901.902.15
Non-ducted, 0.5 tons7171.751.811.972.102.19
Non-ducted, 1 ton1,0641.751.801.902.072.25
Non-ducted, 1.5 tons8861.801.801.872.072.21
Non-ducted, 2 tons5641.801.801.832.042.21
Non-ducted, 2.5 tons2751.801.811.841.862.03
Non-ducted, 3 tons5021.801.801.902.002.09
Non-ducted, 3.5 tons701.821.831.902.002.28
Non-ducted, 4 tons2631.801.801.982.002.10
Non-ducted, 4.5 tons1031.771.771.801.972.02
Non-ducted, 5 tons291.982.002.102.302.47

Source: AHRI Directory · as of

Top Wells models

Its top five cold-climate picks and its top five all-around models across sizes (both scores compare each model with models of its own size and duct type, so sizes compare), then, on each single rating, the model that beats the largest share of comparable models.

Cold-climate picks

Top 5 Wells cold-climate picks across sizes. Qualifies when its capacity retention at 5°F (capacity at 5°F as a share of capacity at 47°F) is at least 70% and Capacity retention at 5°F, COP at 5°F, HSPF2 are all rated. Score = the equal-weight mean of its peer percentiles on Capacity retention at 5°F, COP at 5°F, HSPF2 (share of the other models in its peer group it beats, 0–100), all from one certified pairing: in each duct type a model is sold in, its qualifying pairing of that type with the best score; equal scores (one decimal) go to the higher heating capacity at 5°F.
# · Outdoor modelSize · typeCap. 5/47COP@5°FHSPF2Btu/h @5°FSEER2MeetsCombosAHRI ref.Compared withScore
1WMCA-36HFMOWells · WSA Series3 tons36,000 Btu/h · Non-ducted100%1.9510.936,00021.0CEE 25CEE 26XcelES CC3213307896Non-ducted, 2.5–3 tons87.0
2WMCA-48HFMOWells · VMC Series4 tons48,000 Btu/h · Non-ducted92%2.0010.045,00021.2CEE 25CEE 26XcelES CC3213286781Non-ducted, 3.5–4.5 tons80.5
3WMCA-27HFMOWells · WMA Series2.5 tons27,000 Btu/h · Ducted101%1.9010.027,20019.0CEE 25CEE 26XcelES CC3213286779Ducted, 2.5–3 tons80.4
4WMCA-36HFMOWells · WMA Series3 tons36,000 Btu/h · Ducted100%1.9010.036,00019.4CEE 25CEE 26XcelES CC3213307897Ducted, 2.5–3 tons79.9
5WUCA-36HFMOWells · WUA Serieswith ducted air handler WUA-36CHFM3 tons35,000 Btu/h · Ducted82%2.0010.032,00015.2CEE 25CEE 26XcelES CC5214489062Ducted, 2.5–3 tons78.6

All-around best

Top 5 Wells models on the all-around score across sizes. Score = 50% heating, the mean of its peer percentiles on COP at 5°F, Capacity retention at 5°F, HSPF2, plus 50% cooling, the mean of its peer percentiles on SEER2 and EER2 (share of the other models in its peer group it beats, 0–100). All five ratings are required; there is no minimum heat kept at 5°F. In each duct type a model is sold in, it is scored on its pairing of that type with the best score; equal scores (one decimal) go to the higher cold-climate score, then the higher heating capacity at 5°F.
# · Outdoor modelSize · typeCap. 5/47COP@5°FHSPF2SEER2EER2MeetsCombosAHRI ref.Compared withScoreHeating halfCooling halfCold-climate score
1WSA-09HFMOWells · WSA Serieswith ductless indoor unit WSA-09HFMI1 ton9,000 Btu/h · Non-ducted94%1.9011.626.415.8CEE 25CEE 26XcelES CC1214421469Non-ducted, up to 1.5 tons84.474.894.174.8
2WMCA-36HFMOWells · WMA Series3 tons36,000 Btu/h · Ducted100%1.9010.019.412.0CEE 25CEE 26XcelES CC3213307897Ducted, 2.5–3 tons83.779.987.579.9
3WMCA-48HFMOWells · WMA Series4 tons47,000 Btu/h · Ducted87%2.009.020.911.7CEE 25CEE 26XcelES CC3213286782Ducted, 3.5–4.5 tons82.074.989.174.9
4WMCA-27HFMOWells · WMA Series2.5 tons27,000 Btu/h · Ducted101%1.9010.019.011.8CEE 25CEE 26XcelES CC3213286779Ducted, 2.5–3 tons81.980.483.380.4
5WSA-06HFMOWells · WSA Serieswith ductless indoor unit WSA-06HFMI0.5 tons6,000 Btu/h · Non-ducted101%1.8412.023.515.0CEE 25CEE 26XcelES CC1214421468Non-ducted, up to 1.5 tons80.274.685.874.6

Best model on each rating

Wells’s model with the highest peer percentile on each rating, ranked by that one rating only
RatingModelValueCompared withBeatsAHRI ref.
COP at 5°FWSB-09HFBO2.16Non-ducted, up to 1.5 tons83%214421460
Capacity retention at 5°FWMCA-27HFMO101%Ducted, 2.5–3 tons96%213286779
HSPF2WMCA-36HFMO10.9Non-ducted, 2.5–3 tons97%213307896
SEER2WMCA-48HFMO20.9Ducted, 3.5–4.5 tons99%213286782
EER2WSA-09HFMO15.8Non-ducted, up to 1.5 tons95%214421469
Heating capacity at 5°FWMCA-18HFMO20,000 Btu/hNon-ducted, up to 1.5 tons96%213286775

All 35 Wells models in Explore

Wells size class by size class: cold-climate and all-around

Its best model on each board in every size and duct type it makes. Both scores are 0–100 against every model of that size class (the line on each bar is 50, the typical model there). Cold-climate picks must keep at least 70% of their heat at 5°F; the all-around score needs all five ratings and has no such bar.
Wells: best cold-climate pick and best all-around model per size and duct type, with how many of its models are on each board (top 5 and 5 per class are in the snapshot)
Size and duct typeCold-climate pickCold-climate score, best modelAll-around bestAll-around score, best model
Ducted, up to 1.5 tons52.0(50 is the typical model of its size class)WMMA-18HFMO2 of 2 models qualify · AHRI 21328676159.4(50 is the typical model of its size class)WMMA-18HFMO2 of 2 models have all five ratings · AHRI 213286761
Ducted, 2 tons66.5(50 is the typical model of its size class)WUCA-24HFMOwith ducted air handler WUA-24HFMAH1 of 1 models qualify · AHRI 21330789965.8(50 is the typical model of its size class)WUCA-24HFMOwith ducted air handler WUA-24HFMAH1 of 1 models have all five ratings · AHRI 213307899
Ducted, 2.5–3 tons80.4(50 is the typical model of its size class)WMCA-27HFMO7 of 9 models qualify · AHRI 21328677983.7(50 is the typical model of its size class)WMCA-36HFMO9 of 9 models have all five ratings · AHRI 213307897
Ducted, 3.5–4.5 tons74.9(50 is the typical model of its size class)WMCA-48HFMO5 of 8 models qualify · AHRI 21328678282.0(50 is the typical model of its size class)WMCA-48HFMO8 of 8 models have all five ratings · AHRI 213286782
Ducted, 5 tons and upNone on this board (0 of 1 models qualify)57.1(50 is the typical model of its size class)WSMA-60HFMOwith ducted air handler WSMA-60HFMD1 of 1 models have all five ratings · AHRI 214797744
Non-ducted, up to 1.5 tons74.8(50 is the typical model of its size class)WSA-09HFMOwith ductless indoor unit WSA-09HFMI7 of 11 models qualify · AHRI 21442146984.4(50 is the typical model of its size class)WSA-09HFMOwith ductless indoor unit WSA-09HFMI11 of 11 models have all five ratings · AHRI 214421469
Non-ducted, 2 tons61.1(50 is the typical model of its size class)WSA-24HFMOwith ductless indoor unit WSA-24HFMI1 of 2 models qualify · AHRI 21442147270.7(50 is the typical model of its size class)WSA-24HFMOwith ductless indoor unit WSA-24HFMI2 of 2 models have all five ratings · AHRI 214421472
Non-ducted, 2.5–3 tons87.0(50 is the typical model of its size class)WMCA-36HFMO4 of 7 models qualify · AHRI 21330789676.8(50 is the typical model of its size class)WMCA-36HFMO7 of 7 models have all five ratings · AHRI 213307896
Non-ducted, 3.5–4.5 tons80.5(50 is the typical model of its size class)WMCA-48HFMO2 of 4 models qualify · AHRI 21328678173.8(50 is the typical model of its size class)WMCA-48HFMO4 of 4 models have all five ratings · AHRI 213286781

All-around board, every manufacturer

Newest Wells certifications

By AHRI reference number; AHRI issues references in increasing order.
The 5 most recently certified Wells outdoor models
Outdoor modelSize · typeCOP@5°FCap. 5/47HSPF2SEER2MeetsCombosAHRI ref.
WUCB-36HFMOWellswith ducted air handler H,A,DE32936+TD3 tons33,800 Btu/h · Ducted1.7482%8.115.0CEE 25CEE 26XcelES CC5215297509
WUCA-36HFMOWellswith ducted air handler H,A,DE32936+TD3 tons33,800 Btu/h · Ducted1.7887%8.215.2CEE 25CEE 26XcelES CC5215296855
WUCA-30HFMOWellswith ducted air handler H,A,DE32936+TD2.5 tons28,200 Btu/h · Ducted1.7474%8.115.0CEE 25CEE 26XcelES CC5215296852
WSMA-60HFMOWellswith ducted air handler WSMA-60HFMD5 tons59,000 Btu/h · Ducted2.0050%8.417.0None1214797744
WSMA-48HFMOWellswith ducted air handler WSMA-48HFMD4 tons48,000 Btu/h · Ducted1.9168%9.315.1None1214797743

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Wells includes these brand names as listed in AHRI: Wells. Standards are checked against published thresholds; program rules beyond ratings are not checked.